Generation of shock-free pressure waves in shaped resonators by boundary driving.
Generation of shock-free pressure waves in shaped resonators by boundary driving.
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DOI：
10.1121/1.2713716
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发表时间：
2007-05
期刊：
影响因子：
--
通讯作者：
C. Luo;X. Huang;N. Nguyen
中科院分区：
文献类型：
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作者：
C. Luo;X. Huang;N. Nguyen
本文从理论和实验两方面研究了异形谐振腔中边界驱动产生的高振幅压力振荡。在理论建模中，采用伽辽金法研究了轴对称谐振腔中的声共振。谐振器是指数扩展的，边界驱动由一端的活塞提供。计算了不同膨胀耀斑常数和驱动强度下的压力波形、振幅、谐振频率和谐振腔两端压力比。这些结果进行了部分比较与振动谐振器所产生的。它们也在实验中得到了验证，在实验中，一个指数扩展的谐振器连接到扬声器箱作为活塞。实验进一步扩展到矩形截面喇叭形谐振腔。在这种情况下，边界驱动由圆形压电盘产生，该圆形压电盘形成谐振腔的一个侧壁。在这种侧壁驱动的低纵横比矩形谐振器中观察到轴对称谐振器的特性，如谐振频率和两端压力的幅值比。
Investigation of high amplitude pressure oscillations generated by boundary driving in shaped resonators has been carried out both theoretically and experimentally. In the theoretical modeling, the acoustic resonance in an axisymmetric resonator is studied by the Galerkin method. The resonator is exponentially expanded and the boundary driving is provided by a piston at one end. The pressure wave forms, amplitudes, resonance frequencies, and ratio of pressures at the two ends of the resonator are calculated for various expansion flare constants and driving strengths. These results are partially compared with those generated by shaking the resonator. They are also verified in the experiment, in which an exponentially expanded resonator is connected to a speaker box functioning as the piston. The experiment is further extended to a horn-shaped resonator with a rectangular cross section. The boundary driving in this case is generated by a circular piezoelectric disk, which forms one sidewall of the resonator cavity. The characteristics of axisymmetric resonators, such as the resonance frequency and amplitude ratio of pressures at the two ends, are observed in this low aspect ratio rectangular resonator with the sidewall driving.